26", HDTV monitor, Theatre Wide HD, NTSC standard, "Moving DOTS"

My tv has a series of evenly spaced dots on it that run from right to left across the screen. The dots are easily seen when close to the tv but are not noticable when you are 15 ft away. The dots are multi coloured and usually travel at the same speed across the screen.
I am hooked up to a satelte system. My cable from the tv to the satalite dish is 75 feet.
I am not sure of I have a tv problem or a reception problem?
thanks Vern

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